Swapping transmissions....what else should I do when I pull the trans?

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project_x

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My 4L60e has been slipping and needs to be swapped.
Obviously I need to pull the drive shafts, remove the transfer case, remove cats...
So in addition to swapping the trans, I am looking at doing the following
1. Change U-Joints
2. Install Pump Rub kit and new fluid in NP246
3. New Transmission Cooler lines
4. ???

What other maintenance, upgrade/update should I do while I have it this far apart?
 

strutaeng

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Engine rear main seal!!!

Is the transmission you are swapping a rebuilt unit? If it's a known good, used unit, replace the torque converter lock up O-ring on the input shaft. Maybe also the transmission front seal as well(?)
 
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project_x

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Engine rear main seal!!!

Is the transmission you are swapping a rebuilt unit? If it's a known good, used unit, replace the torque converter lock up O-ring on the input shaft. Maybe also the transmission front seal as well(?)
It is a known good used (rebuilt 20,000 miles ago).
 

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